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The other connections between the Positive and Negative Laptop Battery Omnibook XT1500 laptop battery terminal are used by your computer to communicate with the charge & control circuit that should be in the battery.

Note that when you take a LiIon battery apart, it typically has a small circuit board that handles the actual charging and discharging of the batteries. This circuit ensures two things:
1) That the battery cells do not get charged “to quickly” and overheat, possibly bursting and releasing Hydrogen gas (and possibly burning or exploding Latitude D830).
2) That your laptop does not discharge the battery too quickly (also resulting in overheating, off-gassing, and possible fire/explosions)

Your laptop MAY draw power from a battery Laptop Battery without a charge/control circuit, and it would probably be safe, but I would be very surprised if the laptop would CHARGE the battery before hearing an “everything is OK” signal from the charge dell laptop battery/control circuit.

If the laptop DOES provide power to the battery (for charging) and you do not have a charge/control circuit, you risk the battery overheating and burning or exploding.

My major point: Do not use liIon cells without the proper charge/control circuit. The easiest way to get a charge/control circuit is by taking apart a broken battery (although sometimes they are designed to stop working once the battery cells are used up.)

As for your “in MM165 parallel” question. The correct way to add more power capacity to your battery is AFTER the charge control F2019 laptop battery circuit. (i.e. put a new cell in parallel with each existing cell to double your capacity).

Note that (newer) charge control circuits manage each cell individually, so putting two cells in parallel where it expects one will work OK, but the two cells will be treated as a single cell, so they should both be of the same “age” when you start. If one cell is old and one cell is new, they will be mismatched and it won’t gain you much.

Original X31 batteries F2019A laptop battery were rated at YD626 4.4AH (using pairs of 2200mAh cells). New X31 batteries are usually rated at 4.8ah (using pairs of 2400 mAh cells). You are correct that 3000mAh cells would theoretically give 6Ah of capacity.

However, this is the first time I’ve seen 3000 mAh 18650 batteries, and since I can only find 3000mAh cells listed on Ebay, you should confirm that they are indeed rated as 3000mAh 312-0393 according to industry standards. (Many cells will do better than their rating at the beginning of their life, but typically cells that are rated as “2400″ or “2200″ mAh are guaranteed to provide that F2019B laptop battery capacity for a certain number of charge cycles, etc. These 3000 mAh batteries may just be 2600 mAh cells that happen to give 3000 mAh on the first few charge/discharge cycles, but are really no better than 2600 mAh cells. [Or, they could be a brand new cell that is just better than older ones...]

The link you sent advertised them as having “short-circuit and over-current protection”, so they may already contain Latitude D800 charge control electronics that you would have to remove before using. I have found 4pc of 18650 @ 2600mAh for $25, so the $35 price OmniBook 6000 laptop battery seems appropriate.